Tame body motion and keep the tires planted with the KYB Gas-a-just Suspension Shock Absorber (MPN 553390), a high-pressure monotube gas shock that installs as a direct-fit rear replacement for the 2010-2013 Mazda 3, with components and valving designed specifically for the Mazda 3 MazdaSpeed. This monotube unit uses two separate working chambers: an air-free hydraulic piston and valve area for responsiveness and control, plus a high-pressure nitrogen gas area with a floating piston for a comfortable ride during normal driving and added performance on demand.
- Monotube gas design: Separates the gas and oil for fade-free operation and quick response.
- Up to 25% more damping: KYB rates the Gas-a-just for up to 25% more damping performance over original equipment shocks.
- Triple chrome-plated piston rod: An ultra-smooth rod helps reduce seal wear, since fluid leaking can be a cause of shock failure.
- Quick response: Higher gas pressure is designed to improve steering response and helps keep Electronic Safety Systems performing as intended.
KYB recommends installing new shock mount components (part number SM5619) to reduce the chance of noise and vibration, and protecting the unit with a KYB Strut Boot (part number SB125).
Interchange: BBN528910B · BBN528910C
This part cross-references / interchanges with the following part numbers:
Frequently Asked Questions
Does this shock fit my vehicle?
It is a direct-fit rear replacement for the 2010-2013 Mazda 3, with valving designed specifically for the Mazda 3 MazdaSpeed. Check the Buyer's Guide tab to confirm fitment.
What position does this shock replace?
This is a rear suspension shock absorber. It is sold individually; replacing both sides together as a matched pair is recommended for balanced ride and handling.
What makes the Gas-a-just a monotube design?
It uses a high-pressure monotube layout that separates the gas and oil into distinct chambers, which is designed for fade-free operation and quick response.
How much more damping does it offer?
KYB rates the Gas-a-just for up to 25% more damping performance over original equipment shocks, adding damping for vehicles that work, tow, or run larger, heavier tires and wheels.
Are mounts or a boot included?
KYB recommends new shock mount components (SM5619) and a KYB Strut Boot (SB125) to reduce noise and vibration and protect the unit; consult the service procedure for required hardware.
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